I’m not well versed in histamine and Mast but I think it’s possible. My son has occasional bouts of what almost seem to be a stomach bug or food poisoning but I suspect now that they are histamine reactions (one time it occurred at a hotel where I also experienced a strong mold reaction).
Hopefully this bumps your question up for the more knowledgeable
Bullseye rash 2013.
Following Buhner since July 2017.
Recovering from mold.